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Aortic/Iliac Aneurysm
Simon S. M. Ho, MBBS, FRCR
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KEY FACTS

  • Terminology

    • Imaging Findings

      TERMINOLOGY

      • Definitions

        • Aneurysm
          • An artery is considered aneurysmal when its diameter equals or exceeds 1.5 times the normal diameter (outer wall to outer wall)
        • True aneurysm
          • Composite layers of the vessel wall are intact but stretched
          • Majority of aortic and iliac aneurysms are true aneurysms
        • False aneurysm
          • Occurs when a hole in the arterial wall permits escape of blood which is subsequently confined by surrounding tissue
        • Mycotic aneurysm
          • Refers to infection related aneurysms
        • Arterial dissection
          • Occurs when blood enters the media through a defect (entry site) in the intima and dissects along the length of the artery
          • Intima may be stripped away in some parts and a new lumen (false lumen) may be formed
          • Blood may flow freely through both the true and false lumens
          • False lumen may compress the true lumen
          • False lumen may end up supplying branch vessels and the branch vessels may occlude when the false lumen occludes
          • Most aortic dissections originate from the thoracic aorta although localized abdominal dissection has been reported
        • Aneurysm neck
          • When applied to infrarenal aortic aneurysm refers to the distance between the more inferior of the renal arteries and the origin of the aneurysm

      IMAGING FINDINGS

      • General Features

        • Ultrasonographic Findings

          • Imaging Recommendations

            DIFFERENTIAL DIAGNOSIS

              PATHOLOGY

              • General Features

                CLINICAL ISSUES

                • Presentation

                  • Demographics

                    • Natural History & Prognosis

                      • Treatment

                        DIAGNOSTIC CHECKLIST

                        • Image Interpretation Pearls

                          Selected References

                          1. EVAR trial participants. Related Articles et al: Endovascular aneurysm repair versus open repair in patients with abdominal aortic aneurysm (EVAR trial 1): randomised controlled trial. Lancet. 365(9478):2179-86, 2005
                          2. Zwiebel WJ et al: Introduction to Vascular Sonography, 5th ed. Philadelphia, Elsevier Saunders. 529-69, 2005
                          3. Greenhalgh RM et al: Comparison of endovascular aneurysm repair with open repair in patients with abdominal aortic aneurysm (EVAR trial 1), 30-day operative mortality results: randomised controlled trial. Lancet. 364(9437):843-8, 2004
                          Related Anatomy
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                          Related Differential Diagnoses
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                          References
                          Tables

                          Tables

                          KEY FACTS

                          • Terminology

                            • Imaging Findings

                              TERMINOLOGY

                              • Definitions

                                • Aneurysm
                                  • An artery is considered aneurysmal when its diameter equals or exceeds 1.5 times the normal diameter (outer wall to outer wall)
                                • True aneurysm
                                  • Composite layers of the vessel wall are intact but stretched
                                  • Majority of aortic and iliac aneurysms are true aneurysms
                                • False aneurysm
                                  • Occurs when a hole in the arterial wall permits escape of blood which is subsequently confined by surrounding tissue
                                • Mycotic aneurysm
                                  • Refers to infection related aneurysms
                                • Arterial dissection
                                  • Occurs when blood enters the media through a defect (entry site) in the intima and dissects along the length of the artery
                                  • Intima may be stripped away in some parts and a new lumen (false lumen) may be formed
                                  • Blood may flow freely through both the true and false lumens
                                  • False lumen may compress the true lumen
                                  • False lumen may end up supplying branch vessels and the branch vessels may occlude when the false lumen occludes
                                  • Most aortic dissections originate from the thoracic aorta although localized abdominal dissection has been reported
                                • Aneurysm neck
                                  • When applied to infrarenal aortic aneurysm refers to the distance between the more inferior of the renal arteries and the origin of the aneurysm

                              IMAGING FINDINGS

                              • General Features

                                • Ultrasonographic Findings

                                  • Imaging Recommendations

                                    DIFFERENTIAL DIAGNOSIS

                                      PATHOLOGY

                                      • General Features

                                        CLINICAL ISSUES

                                        • Presentation

                                          • Demographics

                                            • Natural History & Prognosis

                                              • Treatment

                                                DIAGNOSTIC CHECKLIST

                                                • Image Interpretation Pearls

                                                  Selected References

                                                  1. EVAR trial participants. Related Articles et al: Endovascular aneurysm repair versus open repair in patients with abdominal aortic aneurysm (EVAR trial 1): randomised controlled trial. Lancet. 365(9478):2179-86, 2005
                                                  2. Zwiebel WJ et al: Introduction to Vascular Sonography, 5th ed. Philadelphia, Elsevier Saunders. 529-69, 2005
                                                  3. Greenhalgh RM et al: Comparison of endovascular aneurysm repair with open repair in patients with abdominal aortic aneurysm (EVAR trial 1), 30-day operative mortality results: randomised controlled trial. Lancet. 364(9437):843-8, 2004